U of S | Mailing List Archive | alt-photo-process-l | Powdered pigments?

Powdered pigments?

Hi all,

I'm about to undertake Gum printing. I was wondering if it were possible to use the Pan blocks that are sold by Windsor and Newton instead of using their 15ml tubes? What do I need to do to the pan block to make it a powdered pigment and use it for gum printing? I presume just grinding the block into powder and mixing part of it with the gum, then mixing it with the dichromate is NOT the way to go? 
Well any info would be gladly appreciated :)
Jacek Gonsalves
Western Australia